package top.laoshuzi.android.iotcamera.core.network.utils;

import okhttp3.*;
import okhttp3.internal.http.HttpHeaders;
import okhttp3.internal.platform.Platform;
import okio.Buffer;
import okio.BufferedSource;
import okio.GzipSource;

import java.io.EOFException;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.concurrent.TimeUnit;

import static okhttp3.internal.platform.Platform.INFO;

/**
 * Created by mouse on 2018/2/2.
 */

public class Okhttp3Utils {

    public final static class HttpLoggingInterceptor implements Interceptor {
        private static final Charset UTF8 = Charset.forName("UTF-8");

        public enum Level {
            /**
             * No logs.
             */
            NONE,
            /**
             * Logs request and response lines.
             * <p>
             * <p>Example:
             * <pre>{@code
             * --> POST /greeting http/1.1 (3-byte body)
             *
             * <-- 200 OK (22ms, 6-byte body)
             * }</pre>
             */
            BASIC,
            /**
             * Logs request and response lines and their respective headers.
             * <p>
             * <p>Example:
             * <pre>{@code
             * --> POST /greeting http/1.1
             * Host: example.com
             * Content-Type: plain/text
             * Content-Length: 3
             * --> END POST
             *
             * <-- 200 OK (22ms)
             * Content-Type: plain/text
             * Content-Length: 6
             * <-- END HTTP
             * }</pre>
             */
            HEADERS,
            /**
             * Logs request and response lines and their respective headers and bodies (if present).
             * <p>
             * <p>Example:
             * <pre>{@code
             * --> POST /greeting http/1.1
             * Host: example.com
             * Content-Type: plain/text
             * Content-Length: 3
             *
             * Hi?
             * --> END POST
             *
             * <-- 200 OK (22ms)
             * Content-Type: plain/text
             * Content-Length: 6
             *
             * Hello!
             * <-- END HTTP
             * }</pre>
             */
            BODY
        }

        public interface Logger {
            void log(String message);

            /**
             * AppDatabase {@link Logger} defaults output appropriate for the current platform.
             */
            Logger DEFAULT = new Logger() {
                @Override
                public void log(String message) {
                    Platform.get().log(INFO, message, null);
                }
            };
        }

        public HttpLoggingInterceptor() {
            this(Logger.DEFAULT);
        }

        public HttpLoggingInterceptor(Logger logger) {
            this.logger = logger;
        }

        private final Logger logger;

        private volatile Level level = Level.NONE;

        /**
         * Change the level at which this HTTP_LOGGING_INTERCEPTOR logs.
         */
        public HttpLoggingInterceptor setLevel(Level level) {
            if (level == null)
                throw new NullPointerException("level == null. Use Level.NONE instead.");
            this.level = level;
            return this;
        }

        public Level getLevel() {
            return level;
        }

        @Override
        public Response intercept(Chain chain) throws IOException {
            Level level = this.level;

            Request request = chain.request();
            if (level == Level.NONE) {
                return chain.proceed(request);
            }

            boolean logBody = level == Level.BODY;
            boolean logHeaders = logBody || level == Level.HEADERS;

            RequestBody requestBody = request.body();
            boolean hasRequestBody = requestBody != null;

            Connection connection = chain.connection();
            String requestStartMessage = "--> "
                    + request.method()
                    + ' ' + request.url()
                    + (connection != null ? " " + connection.protocol() : "");
            if (!logHeaders && hasRequestBody) {
                requestStartMessage += " (" + requestBody.contentLength() + "-byte body)";
            }
            logger.log(requestStartMessage);

            if (logHeaders) {
                if (hasRequestBody) {
                    // Request body headers are only present when installed as a network HTTP_LOGGING_INTERCEPTOR. Force
                    // them to be included (when available) so there values are known.
                    if (requestBody.contentType() != null) {
                        logger.log("Content-Type: " + requestBody.contentType());
                    }
                    if (requestBody.contentLength() != -1) {
                        logger.log("Content-Length: " + requestBody.contentLength());
                    }
                }

                Headers headers = request.headers();
                for (int i = 0, count = headers.size(); i < count; i++) {
                    String name = headers.name(i);
                    // Skip headers from the request body as they are explicitly logged above.
                    if (!"Content-Type".equalsIgnoreCase(name) && !"Content-Length".equalsIgnoreCase(name)) {
                        logger.log(name + ": " + headers.value(i));
                    }
                }

                if (!logBody || !hasRequestBody) {
                    logger.log("--> END " + request.method());
                } else if (bodyHasUnknownEncoding(request.headers())) {
                    logger.log("--> END " + request.method() + " (encoded body omitted)");
                } else {
                    Buffer buffer = new Buffer();
                    requestBody.writeTo(buffer);

                    Charset charset = UTF8;
                    MediaType contentType = requestBody.contentType();
                    if (contentType != null) {
                        charset = contentType.charset(UTF8);
                    }

                    logger.log("");
                    if (isPlaintext(buffer)) {
                        logger.log(buffer.readString(charset));
                        logger.log("--> END " + request.method()
                                + " (" + requestBody.contentLength() + "-byte body)");
                    } else {
                        logger.log("--> END " + request.method() + " (binary "
                                + requestBody.contentLength() + "-byte body omitted)");
                    }
                }
            }

            long startNs = System.nanoTime();
            Response response;
            try {
                response = chain.proceed(request);
            } catch (Exception e) {
                logger.log("<-- HTTP FAILED: " + e);
                throw e;
            }
            long tookMs = TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - startNs);

            ResponseBody responseBody = response.body();
            long contentLength = responseBody.contentLength();
            String bodySize = contentLength != -1 ? contentLength + "-byte" : "unknown-length";
            logger.log("<-- "
                    + response.code()
                    + (response.message().isEmpty() ? "" : ' ' + response.message())
                    + ' ' + response.request().url()
                    + " (" + tookMs + "ms" + (!logHeaders ? ", " + bodySize + " body" : "") + ')');

            if (logHeaders) {
                Headers headers = response.headers();
                for (int i = 0, count = headers.size(); i < count; i++) {
                    logger.log(headers.name(i) + ": " + headers.value(i));
                }

                if (!logBody || !HttpHeaders.hasBody(response)) {
                    logger.log("<-- END HTTP");
                } else if (bodyHasUnknownEncoding(response.headers())) {
                    logger.log("<-- END HTTP (encoded body omitted)");
                } else {
                    BufferedSource source = responseBody.source();
                    source.request(Long.MAX_VALUE); // Buffer the entire body.
                    Buffer buffer = source.buffer();

                    Long gzippedLength = null;
                    if ("gzip".equalsIgnoreCase(headers.get("Content-Encoding"))) {
                        gzippedLength = buffer.size();
                        GzipSource gzippedResponseBody = null;
                        try {
                            gzippedResponseBody = new GzipSource(buffer.clone());
                            buffer = new Buffer();
                            buffer.writeAll(gzippedResponseBody);
                        } finally {
                            if (gzippedResponseBody != null) {
                                gzippedResponseBody.close();
                            }
                        }
                    }

                    Charset charset = UTF8;
                    MediaType contentType = responseBody.contentType();
                    if (contentType != null) {
                        charset = contentType.charset(UTF8);
                    }

                    if (!isPlaintext(buffer)) {
                        logger.log("");
                        logger.log("<-- END HTTP (binary " + buffer.size() + "-byte body omitted)");
                        return response;
                    }

                    if (contentLength != 0) {
                        logger.log("");
                        logger.log(buffer.clone().readString(charset));
                    }

                    if (gzippedLength != null) {
                        logger.log("<-- END HTTP (" + buffer.size() + "-byte, "
                                + gzippedLength + "-gzipped-byte body)");
                    } else {
                        logger.log("<-- END HTTP (" + buffer.size() + "-byte body)");
                    }
                }
            }

            return response;
        }

        /**
         * Returns true if the body in question probably contains human readable text. Uses a small sample
         * of code points to detect unicode control characters commonly used in binary file signatures.
         */
        static boolean isPlaintext(Buffer buffer) {
            try {
                Buffer prefix = new Buffer();
                long byteCount = buffer.size() < 64 ? buffer.size() : 64;
                buffer.copyTo(prefix, 0, byteCount);
                for (int i = 0; i < 16; i++) {
                    if (prefix.exhausted()) {
                        break;
                    }
                    int codePoint = prefix.readUtf8CodePoint();
                    if (Character.isISOControl(codePoint) && !Character.isWhitespace(codePoint)) {
                        return false;
                    }
                }
                return true;
            } catch (EOFException e) {
                return false; // Truncated UTF-8 sequence.
            }
        }

        private boolean bodyHasUnknownEncoding(Headers headers) {
            String contentEncoding = headers.get("Content-Encoding");
            return contentEncoding != null
                    && !contentEncoding.equalsIgnoreCase("identity")
                    && !contentEncoding.equalsIgnoreCase("gzip");
        }
    }
}
